The two unrelated cases in Brazil may be the first of people contracting Zika via blood transfusions in the current outbreak, though the US Centers for Disease Control and Prevention, along with other health bodies, have said that Zika could be spread via blood transfusions.

That concern led the US Red Cross to announce it is asking travelers to Zika outbreak countries to wait at least 28 days before donating blood.

Canadian officials said that people who have traveled outside of Canada, the continental United States and Europe won't be able to give blood for 21 days after their return.

Brigina Kemp, a top health official in the Brazilian city of Campinas, said yesterday that a gunshot victim and a transplant patient each tested positive for Zika after receiving blood transfusions from different donors.

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